selftests/powerpc: Move Hash MMU check to utilities

This moves a function to test if the MMU is in Hash mode
under the generic test utilities.

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200604125610.649668-3-sandipan@linux.ibm.com

tools/testing/selftests/powerpc/include/utils.h

@@ -60,6 +60,7 @@ static inline bool have_hwcap2(unsigned long ftr2)
 #endif
 
 bool is_ppc64le(void);
+int using_hash_mmu(bool *using_hash);
 
 /* Yes, this is evil */
 #define FAIL_IF(x)						\